Here you normally weigh it yourself. There's a scale near the produce that has a number pad and you press the corresponding number. The number is mentioned in the price listing for the item and sometimes by an icon. Press that and you get a sticker you put on the produce or the bag. Nice for checking out weight/cost too. So it's very similar to the self-checkout yeah, just without the sticker.

Lidl is different, they do it at the checkout. Don't like it myself since I have to be on watch they get it right, sometimes I would've paid a lot more.